[issue11888] Add C99's log2() function to the math library

[STINNER Victor]

STINNER Victor <victor.stinner at haypocalc.com> added the comment:

(Oh, I hit the wrong keyboard shortcut and sent my email too fast)

You can commit issue11888.patch	first if you would like to test it.

In this case, here is a patch to use system log2(), patch to apply *after* issue11888.patch. It only uses log2() if x > 0.0.

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Added file: http://bugs.python.org/file21918/issue11888-part2.patch

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